How can I make my CP modules more stable and reliable?

We've recently rolled out a major compliance training module to our whole company. It was quite a large project about 13mb when published, including audio. It was delivered via the latest version of Saba. Some users had no problems with it - it ran as it was designed to, but at least 150 users experienced quite major problems:
Slides would stick for no apparent reason forcing them to close and restart
Submit buttons would behave erratically
Everything ran very slowly
The simple answer would be to say yes it was too large to run in a stable predictable manner, but colleagues who put together a simple 10 question multi-choice quiz, with no graphics or audio have experienced similar issues.
The result was some very unfavorable feedback and we'll have to work hard to win back the trust of the people who were affected.
Chances are it's linked to our IT infrastructure, but I really don't know where to start with that. The LMS and content servers are based in the US and we're based in the UK. Has anyone had similar experiences - what did you do?
Most of the project was put together in Powerpoint 07 then converted into CP4, I'm now using CP5 and can see that there really is no need to use PowerPoint anymore, except for speed and familiarity. So is there any evidence/experience to suggest that converting .ppts is less stable, larger file size and worse practice than creating everything from scratch in CP5?
Where can I find best practices for increasing the odds of delivering stable learning experiences for my users?
Sorry lots of questions for one post - but I'm looking more for useful pointers than definitive answers!
Thanks
Sam

Everytime I've had issues like this it's been due to latency in the LMS handling the volume of requests from the course modules. It's the luck of the draw when people have these issues because it just depends on how many things are competing for the LMS's attention at the time.
If you get an opportunity to log into the LMS server box and watch the Task Manager while the LMS is being hit you may see the CPU max out due to the load. At this point some users will be experiencing what appears like sticking screens as Captivate waits to hear back from the LMS after it has sent through a pinged piece of information. You can lessen the load on the LMS by setting your courses to only report scores and not scores + user interactions. If Captivate is pinging the LMS after each and every slide, imagine how many hits that poor LMS is getting when you have lots of users.
On one project we also got some help from Andrew Chemey at Adobe to customise the JavaScript in our Captivate HTML SCORM templates so that the lesson only reported once to the server right at the end of the lesson, instead of after every quiz question, which is the normal behaviour. We found this significantly reduced the load on the LMS and all but eliminated the latency.

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